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x^{2}-xy+xz+x+yx-y^{2}+yz+y-zx+zy-z^{2}-z+x-y+z+1
Apply the distributive property by multiplying each term of x+y-z+1 by each term of x-y+z+1.
x^{2}+xz+x-y^{2}+yz+y-zx+zy-z^{2}-z+x-y+z+1
Combine -xy and yx to get 0.
x^{2}+x-y^{2}+yz+y+zy-z^{2}-z+x-y+z+1
Combine xz and -zx to get 0.
x^{2}+x-y^{2}+2yz+y-z^{2}-z+x-y+z+1
Combine yz and zy to get 2yz.
x^{2}+2x-y^{2}+2yz+y-z^{2}-z-y+z+1
Combine x and x to get 2x.
x^{2}+2x-y^{2}+2yz-z^{2}-z+z+1
Combine y and -y to get 0.
x^{2}+2x-y^{2}+2yz-z^{2}+1
Combine -z and z to get 0.
x^{2}-xy+xz+x+yx-y^{2}+yz+y-zx+zy-z^{2}-z+x-y+z+1
Apply the distributive property by multiplying each term of x+y-z+1 by each term of x-y+z+1.
x^{2}+xz+x-y^{2}+yz+y-zx+zy-z^{2}-z+x-y+z+1
Combine -xy and yx to get 0.
x^{2}+x-y^{2}+yz+y+zy-z^{2}-z+x-y+z+1
Combine xz and -zx to get 0.
x^{2}+x-y^{2}+2yz+y-z^{2}-z+x-y+z+1
Combine yz and zy to get 2yz.
x^{2}+2x-y^{2}+2yz+y-z^{2}-z-y+z+1
Combine x and x to get 2x.
x^{2}+2x-y^{2}+2yz-z^{2}-z+z+1
Combine y and -y to get 0.
x^{2}+2x-y^{2}+2yz-z^{2}+1
Combine -z and z to get 0.